Christina Grimmie's Closest Friends Open Up About Her Final Moments

It's been less than a year since singer Christina Grimmie was shot and killed by a stalker after one of her concerts. And her friends are still in shock.

"Christina Grimmie was one of my favorite people on the planet. You never think in your entire life ever that something like this would happen," her friend Tyler Ward says on an upcoming episode of48 Hours. "This just doesn't happen."

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The CBS two-hour special Stalked, which airs Saturday night at 9, investigates Grimmie's death and other terrifying cases of stalking. It's revealed in the special that Grimmie didn't even know she had a stalker before he showed up at her Orlando, Fla., concert with two handguns.

"She opened her arms to hug a stranger and was shot," Ward says in a clip.

Bria Kelly, who became friends with Grimmie when they appeared on The Voice, is fighting to get a law passed that would require increased security measures like metal detectors and armed security guards in small clubs, like the one where Grimmie was killed.

Kelly says of learning about her best friend's death: "When I first heard about it it was just completely surreal — I thought it was a joke."

Pauley Perrette, a NCIS actress who has had a stalker for more than a decade, appears on the special explaining it's not just celebs who deal with stalkers. In fact, there are more than 7.5 million cases of stalking reported each year, according to the Centers for Disease Control.

"What happened to Christina Grimmie should be a huge wakeup call," Perrette says. "Anyone at any time could be the victim of a stalker."